Glass roof.



No. 825,895. PATENTED JULY 17, 1906.

J. DEGENHARDT.

GLASS ROOF.

APPLICATION FILED JAN.12, 1905.

avwznboc Witnesses I F\./ G (I/ o zegj attuned r": "cams PETERS co,wAsumsmu, n c.

"UNITED STATES PATENT OFFICE.

GLASS ROOF.

Specification of Letters Patent.

Patented July 17, 1906.

Application filed January 12, 1905. Serial No. 240,787.

To all whom, it may concern:

Be it known that I, JoHANNEs DEGEN- HARDT, a citizen of the GermanEmpire, residing at Berlin, Germany, have invented certain new anduseful Improvements in Glass Roofs; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to improvements in glass roofs with channeled ortrough-like cross-bars for draining off the sweat, so as to prevent itsdropping.

For this purpose glass plates have hitherto been used whose outersurfaces were arched and which made the roof very uneven.

The particular object of the present invention is to obtain an equallyquick drainage of the condensed moisture from plates Whose outer surfaceis flat instead of being arched and which is effected by providing theunder surface of the plates with ribs, so that channels are formed downwhich the moisture is conducted to the cross-bars or troughs, to becarried off in the usual way.

I will explain my invention with reference to the accompanying drawings,in which Figure 1 is a vertical longitudinal section of apart of a glassroof as per the present invention. Fig. 2 is a cross-section on line 2 2of Fig. 1. Figs. 3 and 4 show glass plates with grooves as per thepresent invention, the grooves being made to run curved or angular.

The glass plates a are provided on the whole under surface with ribs 6,running inclined to the cross-bars c in diagonal, curved, or angulardirection and forming corresponding grooves which lead the moisture fromthe glass into the channeled cross-bar or trough c.

If found convenient, the glass plates can also be provided withlongitudinal ribs, which join the cross-ribs at any convenient angle.

The moisture from the various grooves mixes together on the supportededge of the glass plate and then begins to drop in the cross-bar ortrough c, to be drained off in the usual way.

Having now described my invention, what I claim, and desire to secure byLetters Patent is 1. In a roof, the combination, with grooved beams, ofroofing-plates arranged with their edges overlapping the beams andprovided on the under side with ribs inclined to the horizontal andleading in downwardly-divergent lines from the medial portion of theplate to the ed e thereof.

2. In a roof, the combination, with supporting grooved beams inclined tothe horizontal, of exteriorly smooth glass roofing plates arranged withtheir edges overlapping the beams and provided on the under side withribs inclined to the horizontal and leading in downwardly-divergentlines diagonally from the medial portion of the plate to the edgethereof.

3. Improvements in glass roofs consisting in the combination, withtrough-like crossbars, of glass plates exteriorly flat but provided ontheir under sides with ribs running in a curved direction'from themedial portion of the plates downwardly and outwardly to the edgesthereof.

In testimony whereof I have hereunto aifixed my signature in thepresence of two Witnesses.

J OHANN ES DEGENHARDT.

Witnesses WOLDEMAR HAUPT, HENRY HASPER

